A Compact 5G Decoupling MIMO Antenna Based on Split-Ring Resonators

Abstract

A compact planar multiple-input multiple-output (MIMO) antenna array for 5G band is proposed in this paper. To improve the isolation of compact microstrip antenna array, this paper mainly presents an electromagnetic resonant ring method for MIMO antenna array. The proposed antenna can cover both the 3.3-3.6 GHz and 4.8-5 GHz bands proposed for the 5G band. The antenna proposed in this paper consists of two symmetrical meandered monopole radiators, grid structures, and a Y-shape element. Two different sizes of split-ring resonators (SRRs) are used to suppress the interference of the coupled signal to the antenna system; thereby it can reduce the mutual coupling effect. The experimental results show that the mutual coupling between the two elements is below -25 dB in both of the bands after adding the SRRs. And this antenna is only 23×19 mm2. Its compact size and structure can be used as a mobile terminal antenna.

High Isolation and Ideal Correlation Using Spatial Diversity in a Compact MIMO Antenna for Fifth-Generation Applications

“…Minimizing the mutual coupling would involve reducing the correlation coefficient between the port pairs. ere are two approaches to calculate the correlation coefficient: the far-field radiation pattern [7] and the S parameters [31]. Its value should be less than 0.5 [32].…”

“…ere are many techniques for enhancing isolation by using Electromagnetic Band Gap (EBG) structures [28], Metamaterial Polarization Rotator (MPP) Wall [29], neutralizing line [8,30], Defected Ground Structure (DGS) [8,16], splitring resonators (SRRs) [31], metal strips [18], and selfdecoupled structure [7]. e goal of this paper is to propose a compact MIMO antenna operating at millimeter-wave frequency for fifthgeneration applications.…”

A Compact Absorbing FSS Structure for Antenna Decoupling in the 5G 3.5GHz Band

“…The absorption is achieved through a resistive pattern according to the original idea in [5]. Absorbers based on perfect metamaterials absorbers were recently proposed as a decoupling structure for 5G MIMO antennas [6]. The two first groups of solutions suffer from different drawbacks.…”

Antipodal tapered slot antenna array using broadband decoupling structure for mutual coupling reduction

“…With the extensive research of electromagnetic metamaterials, it is common to use the idea of metamaterials for decoupling. The proposed metamaterial decoupling methods are mostly used in narrowband microstrip patch antenna 11 and narrowband meander line antenna 12 . Although above‐mentioned cases have good decoupling effects by using metamaterial, they are basically in a narrow band.…”